Method for the production of copper-chromium contacts for vacuum switches, and associated switching contacts

A manufacturing method and technology of switch contacts, applied in contacts, electric switches, high-voltage/high-current switches, etc., can solve problems such as unfavorable switching and burning characteristics, and achieve improved switching characteristics, high economy, and low cost Effect

Inactive Publication Date: 2015-05-20
SIEMENS AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in sintered materials due to production technology, the particle size distribution is shifted towards significantly larger particle sizes, which leads to less favorable switching and burning behavior compared to remelted materials

Method used

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  • Method for the production of copper-chromium contacts for vacuum switches, and associated switching contacts
  • Method for the production of copper-chromium contacts for vacuum switches, and associated switching contacts
  • Method for the production of copper-chromium contacts for vacuum switches, and associated switching contacts

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Embodiment Construction

[0028] figure 1 The chromium-copper phase diagram is shown in such a way that 100% chromium content is plotted on the left and 100% copper content is plotted on the right. Chromium is known to have a relatively high melting point, namely 1550°C. In contrast, copper has a relatively low melting point of 1083°C. The eutectic forms at a temperature of 1075° C. at a copper content of 98.2. There is a narrow solubility range for chromium below the melting point of copper. In addition, solid copper and chromium are insoluble in each other below 700°C.

[0029] In addition, the chromium-copper phase diagram is also characterized by a mixed gap (Mischungslücke) in the liquid state, in which a metaeutectic is formed: above the metaeutectic temperature of 1470 ° C, between about 6% copper and 58% copper Two different mutually immiscible CuCr melts occur up to a temperature of approximately 2000° C.

[0030] The latter means for the practical manufacture of a homogeneous copper-chro...

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Abstract

Homogeneous copper-chromium alloys can be produced at best by rapidly supercooling alloys molten at elevated temperatures because of the miscibility gap in the copper-chromium phase diagram. Great efforts are therefore required to produce contacts from said alloys. According to the invention, copper-chromium contacts for vacuum switches are manufactured by producing a thin copper-chromium sheet as a starting material for the contacts, said thin copper-chromium sheet being produced by means of a casting or spraying process, followed by rapid quenching. Concentration profiles in the strip (50) can be adjusted perpendicular to the direction of the strip by adequately conducting the production process because particularly the chromium diffuses to the surface in the form of Cr particles or droplets (Cr).

Description

technical field [0001] The invention relates to a method for manufacturing copper chromium contacts of a vacuum switch. Furthermore, the invention relates to a switching contact produced in this way. Background technique [0002] Vacuum interrupters for energy supply and distribution require electrical switching contacts made of lichtbogenresistant material capable of withstanding locally more than 5 MW / cm 2 high-temperature loads, does not release gaseous or other harmful pollutants and can be produced particularly economically. [0003] In most cases, copper-containing materials are used for the switch contacts in vacuum interrupters, and its main part is a mixture of copper (Cu) and chromium (Cr). % (mass percentage). The special contact shapes used in vacuum switching technology (button or disk contacts, screw contacts, pot contacts, or axial field contacts) necessitate machining of the contact area, thus requiring at least 2 to 3mm material thickness. [0004] A ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00H01H33/66B22D11/06
CPCB22D11/004B22D11/0611C22C9/00H01H1/0203
Inventor 沃纳·哈特曼罗曼·兰兹安德烈亚斯·斯特尔泽
Owner SIEMENS AG
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